WPC-style conversion: plunger, springs, bats and coil
Plunger/link/pawl B-10655-L/R. A-15848-L/R turns up often, but its link does not suit a conical plunger spring; pick the link to suit your spring. Pawl alone A-17050-L/R; plunger/link alone A-15847 (non-conical spring) with spacer bushing 02-4676. Springs: 10-376 conical, or 10-364 non-plunger style (more robust). Bats: originals usually reusable, or WPC 20-10110-6 (yellow) / 20-10110-5 (white). First-generation coils are too short for WPC mechanisms; use SFL-19-300-750 (as on Firepower), SFL-19-400/30-750 (slightly weaker), a System 11 coil, or a WPC coil of similar power such as FL-11630.
Systems
Related tips
- Coil sleeves and flipper rebuild spares
- Flipper rebuild step 6: pawl, plunger, link and bushing
- Flipper rebuild part numbers for System 11
- WPC flipper coils, weakest to strongest
- Williams 50 V fat flipper coils ranked by strength
- WPC flipper coils from weakest to strongest
- WPC flipper coils, weakest to strongest, with resistances
- Flipper coil strength order (WPC flipper coil strengths file)
Source: Repairing Williams System 3 to System 7 Pinball 1977 to 1984, Part Three, Clay Harrell (pinrepair.com)